Electric motor driven vibrator and adjusting device therefor



Sept. 5, 1967 f F. PETRIN 3,339,422

ELECTRIC MOTOR DRIVEN VIBRATOR AND ADJUSTING DEVICE THEREFOR Filed March 18, 1.965

, Z n 76 f INVENTOR FQA/VK Pf new BY W 42 United States Patent O 3,339,422 ELECTRIC MOTOR DRIVEN VIBRATOR AND ADJUSTING DEVICE THEREFOR Frank Petrin, 41-10 Judge St., Elmhurst, N.Y. 11373 Filed Mar. 18, 1965, Ser. No. 440,798 4 Claims. (CI. 7487) ABSTRACT OF THE DISCLOSURE An electric motor driven vibrator of the type having a shaft with fixed and movable eccentric weights mounted thereon, and means for varying the position of the movable weights in relation to the fixed weights.

This invention relates to an electric motor driven vibrator of the type constituting a rotor having a shaft extended thereto and a pair of fixed eccentric weights mounted on the shaft on opposite sides of the rotor, and contemplates the use of an additional pair of adjustable weights on the shaft, together with means for varying the position of adjustment of the movable weights relative to the fixed weights, so that the degree of eccentricity of the combined weights may be varied resulting in an increase or decrease in the vibratory effect of the device.

A further object of the invention is the provision of an arrangement of this nature whereby the relative position of the movable weights may be adjusted by turning a dial at either end of the shaft, and contemplates means for fixing the adjusted dial in a selected position of adjustment, so that a predetermined degree of eccentricity of the weight at one end may be duplicated in the weight at the other end.

A still further object of the invention is the provision of a device of this sort including novel means for connecting the components thereof.

A further object of the invention is the provision of a device of this nature wherein the weights may be readily adjusted without disassembly of the apparatus and from the exterior of the device.

A further object of the invention is the provision of a device of this character which is sturdy and durable in construction, reliable and eflicient in operation, and relatively simple and inexpensive to manufacture, assemble and utilize.

Still other objects will in part be obvious and in part be pointed out as the description of the invention proceeds, and shown in the accompanying drawing wherein there is disclosed a preferred embodiment of this inventive concept.

In the drawing:

FIGURE 1 is a side elevational view of one form of apparatus constructed in accordance with the instant invention.

FIGURE 2 is an enlarged end elevational view thereof, taken substantially along the line 22 of FIGURE 1, certain concealed portions thereof being indicated in dotted lines.

FIGURE 3 is an enlarged view of the interior assembly, showing the rotor, the drive shaft, and the fixed and movable weights associated therewith.

FIGURE 4 is a sectional view taken substantially along the line 4-4 of FIGURE 3 as viewed in the direction indicated by the arrows, and

FIGURE 5 is a fragmentary sectional view showing a detail of construction.

Similar reference characters refer to similar parts throughout the several views of the drawing.

Having reference now to the drawing in detail, there is generally indicated at 10 a vibrator housing, which is generally cylindrical in configuration and includes a base 11. The housing contains an electric motor including a rotor 12 and a shaft 13, the ends of the latter extending through suitable bushings 14 carried by end plates 15 on opposite sides of the casing. The plates are held in position by bolts 16, and electricity is supplied to the motor through a conduit 17 and an inlet box 18. In accordance with the instant invention, a pair of fixed weights 19 are eccentrically mounted on opposite sides of rotor 12 on the shaft 13, the fixed weights being permanently aligned, and the alignment being assured by means of a locking pin 20 extending through the rotor and into the fixed weights 19 on opposite sides of the device. Mounted on the shaft 13 at opposite ends thereof and exteriorly of the fixed weights 19 are a pair of movable weights 21, each of which includes, as best shown in FIGURE 4, a cylindrical collar 22 which encircles the shaft 13, and a wedge-shaped eccentrically mounted weight portion 23.

Each portion 23 has a bore 24 therein which is seated an adjusting pin 25, the latter in turn having an external transverse bore 26 through which extends one end 27 of an L-shaped connecting rod, the other leg 29 of which seats in a groove 30 cut in the side of the end portion of shaft 13.

The outer end of leg 29 is flattened as at 31 and extends through a corresponding rectangular opening 32 in an adjustment dial 33. Each dial 33 has a bore 34 therein, one end of which is reduced as at 35, and the other end of which is closed by a threaded plug 36. An adjustment locking pin 37 extends through the reduced portion 35, and is spring biased towards extended position by means of a compression spring 38 extended between a plate 39 carried by the pin 37 and a plate 40 at the inner edge of the bushing. The opposite end of the pin 37 extends through an opening 41 in bushing 36 and terminates in an operating head 42.

Each end of shaft 13 is provided with a semicircular series of pin-receiving openings 45 which are concentric with the flattened end 31 of leg 29 of the L-shaped rod.

The arrangement is thus obviously such that as the dial 33 is rotated, assuming that the pin 37 is raised by means of knob 42 so as not to engage in any opening 45, the weight 23 is swung to a different position of adjustment relative to the shaft by the engagement of leg 29 with pin 25. By engaging pin 37 with a selected opening 45, the degree of eccentricity of each of weights 21 may be fixed with respect to weights 19. It is essential to the proper operation of the device that the adjustment of each of the weights 21 be the same at the opposite ends of the device.

From the foregoing the use and operation of the device should now be readily understandable. It will be seen that in order to adjust the relative position of weights 21 with respect to fixed weights 19, it is merely necessary to remove the cap or bushing 14 from its associated end plate 15 at each end of the device, and by releasing the pin 37 through head 42, adjust dial 33 until the desired degree of eccentricity of each weight 23 has been obtained.

The pin 37 is then allowed to seat in a selected opening 45, and the weight is thus permanently maintained in a selected position of eccentricity on the shaft 13. The vibrator in operation will afford greater or less vibratory effect in accordance with the relative angularity of the mounting of weights 21 to the eccentricity of weights 19.

It will now be seen that there is herein provided an improved vibratory device having adjustable weights, which accomplishes all of the objects of this invention,

and others, including many advantages of great practical utility and commercial importance.

As many embodiments may be made of this inventive concept, and as many modifications may be made in the embodiment hereinbefore shown and described, it is to be understood that all matter herein is to be interpreted merely as illustrated, and not in a limiting sense.

What is claimed is:

1. An electric vibrator including a housing, a rotor in said housing, a rotor shaft extending concentrically axially through said rotor, a fixed weight concentrically mounted on said shaft at each end of said rotor, said fixed weights being aligned, rotatably movable eccentric weights mounted on said shaft adjacent said fixed weights, means for varying the eccentricity of said movable weights relative to said fixed weights, and means for securing said movable weights in a selected position of adjustment, said last mentioned means being accessible from the exterior of said casing.

2. The structure of claim 1 wherein a groove is provided in the surface of said shaft at each end, one leg of an L-shaped member is rotatably seated in said groove,

the other end of said L-shaped member is secured to said rotatably movable weight, and means, comprising the means for varying the eccentricity of said movable weight are provided for rotating said one leg in said groove.

3. The structure of claim 2 wherin said last mentioned means comprises a dial secured to the end of said one leg adjacent that end of said shaft.

4. The structure of claim 3 wherein the ends of said shaft are provided with openings and the dial carries a spring pin engageable with a selected opening, comprising the means for securing the movable weights in a selected position of adjustment.

References Cited FOREIGN PATENTS 528,087 4/ 1954 Belgium. 1,202,229 7/ 1959 France. 1,103,658 3/ 1961 Germany.

20 FRED c. MATTERN, JR., Primary Examiner.

W. S. RATLIFF, Assistant Examiner. 

1. AN ELECTRIC VIBRATOR INCLUDING A HOUSING, A ROTOR IN SAID HOUSING, A ROTOR SHAFT EXTENDING CONCENTRICALLY AXIALLY THROUGH SAID ROTOR, A FIXED WEIGHT CONCENTRICALLY MOUNTED ON SAID SHAFT AT EACH END OF SAID ROTOR, SAID FIXED WEIGHTS BEING ALIGNED, ROTATABLY MOVABLE ECCENTRIC WEIGHTS MOUNTED ON SAID SHAFT ADJACENT SAID FIXED WEIGHTS, MEANS FOR VARYING THE ECCENTRICITY OF SAID MOVABLE WEIGHTS RELATIVE TO SAID FIXED WEIGHTS, AND MEANS FOR SECURING SAID MOVABLE WEIGHTS IN A SELECTED POSITION OF ADJUSTMENT, SAID LAST MENTIONED MEANS BEING ACCESSIBLE FROM THE EXTERIOR OF SAID CASING. 